Definition of nannofossil in English:


(also nanofossil)


  • The fossil of a minute planktonic organism, especially a calcareous unicellular alga.

    • ‘This paper presents high-resolution data from calcareous nannofossils, planktic Foraminifera, palynomorphs and stable isotopes for the Late Albian OAE Id.’
    • ‘As revealed by light microscope and SEM studies, nannofossils are moderately to well preserved with slight indications of overgrowths in the marlstones.’
    • ‘The same samples as used for geochemistry were investigated for their content of calcareous nannofossils.’
    • ‘In the seas, the calcareous nannofossils were still in evidence but in shallow waters the benthonic nummulite and other larger foraminifera became very abundant.’
    • ‘These deposits were correlated with the calcareous nannofossil zones NP 24 and NP 25.’
    • ‘An increase in the relative abundance of boreal nannofossils in Romania during the late Valanginian also supports low temperatures within Tethys during this time.’


1960s: from nannoplankton (variant of nanoplankton) + fossil.